Garden Hose Water Usage Calculator — Gallons from Flow Rate & Time
Enter your hose flow rate in gallons per minute (GPM) and the watering time in minutes to estimate total gallons delivered. Measure your own GPM — hose flow rates vary with water pressure, hose diameter, and nozzle.
What this calculator determines
It estimates the total gallons a garden hose delivers from the hose flow rate (GPM) and the watering time in minutes.
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Examples
8 GPM for 15 minutes
8 GPM, 15 min
Calculation
- Gallons: 8 × 15 = 120 gal
120 gallons
Assumptions & Conventions
- Volume formula
- Gallons = GPM × minutes; liters = gallons × 3.785.
- Flow rate
- Hose flow varies with pressure, hose diameter, and nozzle — measure your own GPM with the setup you actually use.